India, Sept. 12 -- BTS leader Kim Namjoon, known as RM, clocked his 31st birthday on Thursday. Taking to his Instagram Stories, Namjoon sprang a surprise on the BTS ARMY as he debuted with a blonde hairdo on his special day.

In a photo, Namjoon gave a peek at the menu of his meal on his birthday. It consisted of small bites, summer squash noodle and roasted sesame. "Happy Birthday" was written at the top of the page. Namjoon shared it with a kissing face emoji. He shared several photos which he clicked while driving around in his car. They showed banners wishing him on his birthday and messages on buses for him.

Namjoon also shared a selfie in which the BTS leader stood in front of a mirror. Dressed in a white vest, Namjoon debuted with...